That's what I mean though, official kits so you would have Konig, Novitec, Gemballa, Reiter Engineering, Hamann, Edo Competition and the likes for the high end cars and the usual suspects for the more everyday models. Though more than likely Ferrari's would remain as is as they don't like their cars being done in anyway apart from how they are which is fair enough and they will probably never change from this.
I have to agree with most though that it is mainly the ability to change and colour wheels that I would have to say I would like the most in regards to customisation. Lowering the car would be sweet too as well as possibly giving the car Xeons and the option of clearcoat or smoked lenses. Nothing rice, F&F or NFS, keep it tasteful in regards to the vinyl editor, yes it would result in some bad examples but come on who wouldn't want to replicate their car or try their hand at creating some kind of livery of their own. Think of the best one in fact, make your own police cars!! lol
I have to admit the key customisation (not tuning) options I would love to see are:
* Ability to change rims, size and colour them
* Lower the car
* Officially licensed kits
* Interior options like seats, wheel and of course neon ....just kidding on that last one. :D